And your song doesn't have to be about a town. See "The Roof" I just posted above
You could also write a song about a few specific incidents that took place on a park bench, or the imaginary world you go to when your parents make you mad, or the specific classroom where you seduced your teacher, etc. etc. Doesn't have to be about a town. The PLACE needs to be very clear though and the song needs to be centered on it.